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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942db809e12daf74150f1131c6e1c9052bcdb9a36faca178f6b335d155183909' 
  AND token = 'MT3E3uHffDJiUmjt0VX4PlpsCTeA5sGFzw3Nx/QvHZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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