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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec31cab4988db560fa28dd24414b80e1bbc60987e92f491bc8471dd3e10a778' 
  AND token = '0VadKTfJF5Iij8WUKOboc27PcW5abizq69bi/44HLgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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