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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d04a0b82721f5842ab9c026a2505947f20fc10a18c2b42bc1a9e226203ac60b' 
  AND token = 'Tp1hZv2N6cJAZ7+Mu3tjKdFzbvf1sjuGZHR+EHYwUGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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