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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a137be6fdc7808a6d7cfc1d2c6a6578b9ce9fdba8312c74fe83808f25838a2a3' 
  AND token = 'vu6//Tp+ivfJOYP7JgYgURE65iuB8V127hxxeDu9Z88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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