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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abbbe1cd4a04a424f748f76bc695cc70b24906570adc65764bd33501e0f88eef' 
  AND token = 'CUX9NPLit8gQ7wkb+TPC0//Hp2I+n+9bC7ZWFz+QVrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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