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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e38a77d16ad98fa2c256f61f0ebbccf37518ddd97284244e282bd8ae091e842' 
  AND token = 'tGUe30pBBz9gOPtg3uVX4Ab4rRozLmZoi3SmWbdNlpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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