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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11cfd9fcdecf9119a1b6ed811806d7e97d28143a7af4a0a26480290619936239' 
  AND token = 'Ty6ilz8DYy5plfLdR9MsQ5q0LiyzsG+hOivklPD/qhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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