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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6e9da79f6709ef774c3303d54b35146b3fb59e9c916a843f7a1e82c3dc148e1' 
  AND token = 'ZI5b6US99hydsgN64ar3OCnh1+qO+p/2QmUP/YEok8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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