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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dcedd410417cdd40d53e3438d29478aef932b77b04d5f372e11ba97aa106089' 
  AND token = 'xRHQyc92xEE5hj4uhm8kqfQdVxKm1p7xc8duPhdeZJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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