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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c386400f8b911d10e131ac3d51cb84c23343a8e2098326e8ccf83038dfcaf70d' 
  AND token = 'DHl72odp51DZxN3Bg4lzSYQ1pq4pWkm10kaQTcCpH3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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