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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd861f614ab078427520cdc9dd91e9d1ed2b7f350b8623816096aab5fde1f5c93' 
  AND token = '+rqO8TYNQhpkQ0N1KxVUW4Am970wfdzyPu+Ty6ym1+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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