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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '272f6bd5db1d17eae205b0ed7e0d5bea7808a75466c2e00ab26f84d94a1e83d6' 
  AND token = 'NL6saf6v/PoVggbBQhLKjKdJ5zplpIy1ctXSerkm61I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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