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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1419135aa0d412d12121580a851d866f1585c3a7a524f9fc846d0a3b9da555c' 
  AND token = 'D34OIR81t9xGnT+NHbalYsZlyWgLCiMlcYxBSGRJjjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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