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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9918e5e11b6da5a1e4cda26659c176b934fa996b6d5c9baad14291f4c10031e5' 
  AND token = '9grJOLO8ih9Km2iMCwmdjEsBMqP1TuBlGWkq/DnqYEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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