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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873051e28de2eb176effc1f19a292502352b2990e7fc173c7aa0a772dc908960' 
  AND token = 'x2YSwzKu6N+TO2tElzckHGBYxSJV4LRt00lhXi2x/0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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