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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd164980cd919d579ab248e53524e9afa870784583d01e8eef283289f493ac93e' 
  AND token = 'mtyOxRl7uQE2D+ehQ1iXKCewSIj17eidY3g0mFVBDWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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