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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11f0a64c6768fc5cd0fffd559b2c9a4d34c8bdd0b8664f59c8f54615f6157aa' 
  AND token = 'hruS5UzrWJO7J0WsyMaDeJA4ejFVj56L218D7EoXANM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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