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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec995e4c3ee105a52a56c3ae8c4710ca40112d31d207d21fd5b68dd755cd86c' 
  AND token = 'J1ZksLf3pu6e6fs13u6J0NgCwvHKDqkADc0B3eqL2HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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