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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e46ee4267fe8995d3ddc0001b4aa16d542b2786cb7142344ecfe5bc597bab5' 
  AND token = '61fqSlgA9fhThf1P4Rk62wTB6VqtwFSJKt5fEOl9D1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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