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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5953830f89b8b197751cbcdde049df5507912f9c59b2f776e2acfed7161c9308' 
  AND token = 'S5WnUruep5NcXLZTmrNBpA+elN3xxeuCRMrLx4AZ7/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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