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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca39702055563d67031a92365cd55d3849a965809da0361e28674c5aa2cc9cb1' 
  AND token = 'HusOf4NtTt31A75+Lf9HoWUxdPVTNPAunpz09Zq/Ya4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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