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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ae3e37af22509bda50a3a5d2c6e12d4e6765a37deb40b1700a1639afef6fd3' 
  AND token = 'J5X7M8Q4AUSEdri85DOqfeZW4VQ2emwgbbRi5PJdKEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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