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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18659689ece10e3d582cddfd58772927587eac0ae7c5ca9dc293287c7b338d76' 
  AND token = 'fIS3O0SeOE/7E3WIqdm4s0Tl66497KSepMjz6Np4GaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}