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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d1a688fbe7750d441cdf63c692e77ae220a171adce52db9b60c2fd8dfd245f' 
  AND token = 'kF/QPe7khHEShXrsJmj2Sk+6EyxxJUWM6Kf+9meh90Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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