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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e1114a26437cd3f546ee9345dc46232ba070d0b6946539bb9c04621c02a566c' 
  AND token = 'vANta00E5JIMQQV8rDBD5s1EsHiPjfiMP3ClfBINyyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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