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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91098946c01a0193e6ea2037aaa564dd78181d8fc5bee2b9dde357a81ea7489c' 
  AND token = 'XKm4igJR9YDwO5O2aEG9L6zZesEf8vE374n24v0S/LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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