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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d1d0cd3f152cd01e63d202eae23facb26ca9c2ee6df8b87193963483784e2a0' 
  AND token = 'sxc0j9IjGW09APkb84ODGFD7NgMZMsEGTrVmr7XNr0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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