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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4acc62cef342152c91961356fbb944d06b2034c218af80a525b7c41b65cf6b14' 
  AND token = '2RERguuuT88eW0khy5H393nS5vqwYNrA99c1rLz/NKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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