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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055fc9b12161e52a81d6570385c0cb339d48c9b4299eb9c688949c636f918ef6' 
  AND token = 'sAeUkTId9mHsKhJZZu97k93IU4809KEbB4nK7bxn1i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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