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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d825f4a185fe40085d3b43b1d2fa20ba19483db1159bfd4e45ace642e8acf07' 
  AND token = 'jnOcTde/slZvIB9JC19TwsjfHAddmlbo1Q41iEBts5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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