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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24acb479d9495e7a924dff9c3bc31095605a307ed1d5fbe04f860b78d0ddfbae' 
  AND token = 'Q9mw1zNHlJ6vDS2RXapDCb4YCkW1F+hdr4nL4gsjcUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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