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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c1e092bdc791a1c792aba1498e3685fb8bbdcd9297eb0cf200ee1fca3e78e2' 
  AND token = 'NqDFKkCVtZIe8A/q63HCJNBjr6U4ydFovB7vf5PVjR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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