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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5567afe7348e558708d06ed8a5d3bfea69d8a2fe4e3922ebb95305331b683e6e' 
  AND token = 's+tACcfPxzXe5QbYUhsXdzv61KkQhSH0oC8cFdU43EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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