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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '555ecc3cb63397e4bfad19e68d88f28bd2dbef6f6286eabd175ca62e38c728a9' 
  AND token = 'zNeerbOmkmFgsgV5dsOqZMSno2J6+cYLGQx1oHh2tm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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