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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0b5ddff50dd19379b3646b9d89606db219dea9164aeb068a3f1debe2c005d1' 
  AND token = '09Qc+JBuCnVFS0r7AWIPBiL2SlAb6TF+4IELdNgH6gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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