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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba54b51b5294f1fbd3ddab1cf0d643ab79819f600bc823f2266efa31ca366bf' 
  AND token = 'v6alMDr5kAQkTps4truLLvTHn+sg5J9ChcuRCVeogtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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