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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1800c6b4ef894aec30dda1ddbde0a3e5995283900b769651b92ac88a33594d7' 
  AND token = '16ZgiEDOqGSJEwxzteYhSjpptLjN7ifDf8OT14E+y64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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