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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70240136687524939a0537d9c45cf38b16fc1f494b9d3f1de358e715204d02b' 
  AND token = 'cs5NbWg+uTGe0pNiWrC1nmJd8TJboSuusNhYblaI68g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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