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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02d63b29ba03deb5f0c9015aaf7f4a336ab0e753165dbe8c9ea77ba9d35404c' 
  AND token = '2dZvPByyNez453NFaqxazPxVdoQzDf4MsYjgDjuZsOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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