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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e28f667cf9f1f5e890b3f8f7c405c36cd8ca55ec2c3bbb9c32e7ef02d4de12b9' 
  AND token = 'dJq+sBDS8sFvjAx98ozYfNnB+DGXjPfz6PkxoBLrWB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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