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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89ad4aa2fa8c715a7159e95d47000b30f97b1cb87c8ec0e7873b436b70eb8d32' 
  AND token = 'NAgcuT7fVQLC1oxA1JpackIF5nFUuTOzz77oAab8ej0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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