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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2291527f4442b14605f2abf6efd15ea743519e76c0f2f1a70fd061acad86e6' 
  AND token = '9QdjenFDmVC7Z1LeV3vTvCbQh9iUzxngs/IEpiYmQzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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