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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fee0cf0e9a82fd7980e9b6f5f7364a5f8dde841274d5faf0b8f745711beee9c' 
  AND token = 'Kw0t95udC2iCayAszB+3Z92w8TqFfvHsJvR1YMG5QaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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