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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69db5d99c89f50f30ef14b04eaa5e3f640bc3cf5f43cea3f5e7a1d7f3fd8be5f' 
  AND token = 'EAzz/4t/Dqh37FeuDLZ6hu9voIEI0n6p+tHuQa+XWrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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