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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55ed4417bf4e928904fd912cc87553959140222c029f12e418c9f1d1366cea4' 
  AND token = 'Gvo25HcG9qOBHk7xyXhA30tbKSokEOeSNOztmFjPKTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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