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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f0bca7f6d2d1e2d43baebf3f0d12aa81ebbef70bf7ec6463f7f5c773b322b8a' 
  AND token = 'qedB1yFES2d8Dn1ikRVX1E5IA3uhozhn3KwmQ/KoDf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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