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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c582fc0b7ef93e507210c5bf2687b0393a439217627b36bccc679151b86f75fc' 
  AND token = 'e7QMwonVv9vJivY5yLKiWRfOHxQNVBPnBkMaVykNCPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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