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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14be8e03feebd35d024152495a6fc980e8932956efdc270eb58ee7bb57ae3fb' 
  AND token = '/QdZdVyo6M3z9bj90WRdxrtzTtCTWT4t3xbBU5FfHDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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