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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12476965d7315ec916f985a2551eb5b7de4ee1c8e0399898b6c02e86cc370eff' 
  AND token = 'fe9d1tcHEH2D8InonlN0hcQJDHAc+kBKvEeSWHlllHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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