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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eedbb9163e9f0a732c8f01cc7e203cbb2121622289b11696b7cfd9d559b3833' 
  AND token = 'kqTYJwgMx+itK1lEgi1fP4lsyXQg3cJFq8Pvdh8Swyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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