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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd8902cdcbcdeaa7126f84ea6e1f1f7162e28652eee4a7ea999e982e260ff64b' 
  AND token = 'z6VVZQ2FppQxA/wgU9ZrMp/hG+FSrQfEy14SeQB36Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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