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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e18a7b130d3d00397588d8f34636ed400b45378a288e24a17c62fa965503cb6e' 
  AND token = 'Bi9DcHYxQiFS+ZwfeG0XB35y7q3MPSaarSWoNz+JyKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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