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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9235a2e7a4869f85359969d2b9c59f3e901399ad9e62333acc1998a35431ddd7' 
  AND token = 'Q3WyQ6wn1rmqdS7YN/PMj1E2/gFHw5MsJRAA8ucOUiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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